**Author details**

Helena Cristina Vasconcelos1,2

1 Faculty of Sciences and Technology, Azores University, Ponta Delgada, Portugal

2 Faculty of Science and Technology, Department of Physics, Centre of Physics and Technological Research (CEFITEC), New University of Lisbon, Caparica, Portugal

\*Address all correspondence to: helena.cs.vasconcelos@uac.pt

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